DHCP stands for Dynamic Host Configuration Protocol and is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol.

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Ubiquity AP keeps people from connecting sometimes. Happens with a couple other AP's as well

I believe this is ok for server fault, forgive me if not. We have had numerous very cheap AP's and I am trying to purchase a mid tier product now. We had EnGenius ENS 202EXT and a couple home office ...
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1answer
38 views

Is there a benefit to assigning a static IP to an instance instead of DHCP

We are creating a Windows AD instance in our AWS VPC and we're wondering if there is any benefit to assigning a static IP to that instance instead of using the default behavior of a subnet which is to ...
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1answer
66 views

Create DHCP for 1000 Users

Currently we are running windows server 2003 with static ip for 200 users ,now the organiszation is about to expand so atleast 1000 people will be working, so i needed to create a DHCP for 1000 users. ...
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0answers
58 views

DHCP Discovery being Ignored

I'm having some real issues with a DHCP server I've setup. I'm at my wit's end, having found no answer anywhere to this problem of mine. Here's the setup: I have a CentOS server machine, running ...
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1answer
32 views

Priority of dhcp servers

Let say there is a main Server which is assigning ips by dhcp to 50 different LAN ports in network.Now if at some LAN port we connect a small router on the yellow port(so that all other devices come ...
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2answers
99 views

Window Server 2012 with external DHCP

I have a Cisco router connected to a server with Windows Server 2012 fresh installed on it. What should I do to configure DNS if I leave the DHCP of the Cisco router active?
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1answer
22 views

set host-name failed on Ubuntu vivid

With Ubuntu vivid, I cannot bind the hostname of my server with the IP address gotten by a DHCP server I tried to add in dhclient.conf (and reboot) set host-name "myserver"; But, still doesn't ...
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1answer
25 views

Network is DHCP - Can I manually set an IP to a device?

So as of right now, our SonicWall controls DHCP leasing. We have a bunch of network objects that really need to remain static (I plan on converting the network to static later), but I need a fix in ...
2
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1answer
72 views

DHCP Server with 2 nics

I have windows 2008 r2 x64 enterprise server with a domain. That server has 2 NIC nic1 which is connected to a router nic2 - here i need 1) run dhcp for private LAN 2) forward internet connection ...
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1answer
32 views

DHCP Server Offers, But Client Doesn't Accept

I currently have a development node that runs KVM virtualized VMs. There is a DHCP server running on the node to provide addresses to the VMs. I had DHCP working previously, but I reinstalled one of ...
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1answer
99 views

CentOS DHCP server gives DHCPNAK upon DHCPREQUEST from client

I'm trying to setup a DHCP server on a virtualized host only network and I'm having some issues. Currently I'm only running two VMs one being the server and the other being the client both VMs are ...
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2answers
40 views

Is it possible to use Win XP as a DHCP server in a network? [closed]

Is it possible to use Win XP as a DHCP server in a network ? Does Win XP can give automatic IP addresses to clients in a network ??
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2answers
82 views

Expanded DHCP scope, new reverse lookup zone isn't populating

I'm running a Windows Server 2008 R2 domain. We outgrew our /24 DHCP scope, and I ended up needing to expand it. This was done by exporting the old scope, changing the txt config, deleting the ...
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1answer
45 views

Using Clonezill/DRBL DHCP as main DHCP server

Right now in my department we are running a DHCP server on some older hardware that is looking like it might fail soon(ish) and is also running CentOS 4. We'd like to upgrade to a new DHCP server but ...
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0answers
62 views

DHCP failover/DNS not working when primary server is offline

In a VMware environment we deploy daily many new virtual hosts and for this we need a failover DHCP/DNS. Based of CentOS 7 I setup two virtual hosts as failover DHCP and dynamic DNS (dns01/dns02). I ...
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2answers
60 views

How to secure network against connecting bad device with DHCP?

I have a network with 500+ computers, at my area there is lots of cooperation companies that sometimes bring their own routers. If they do it in sneaky way and do not turn off DHCP service on the ...
9
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1answer
266 views

What are the practical risks of enabling the unsecure DNS updates on Windows?

What are the practical risks of enabling the unsecure DNS updates on Windows? As far as I found enabling the unsecure DNS updates is a requirement for enabling DHCP Linux clients from registering ...
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4answers
751 views

What happens if the DHCP server comes online after the client devices do?

If I have a Windows PC running a DHCP server. I expect it will take on order of minutes a few to boot. My network will have a variety of other devices from various vendors that will boot within ...
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0answers
20 views

Could dhclient be causing haproxy to stop listening?

I've noticed every 7 days HAProxy stops responding to requests correctly - it automatically makes firefox download a blank file in place of the website. Upon inspecting the server - everything seems ...
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0answers
30 views

Wireless clients loosing network access randomly

We have the following setup at the office: Windows Server 2012 DHCP Unifi AP (one of these rounded beauties) set up to use WPA2 with AES Zyxel ZyWALL 110 as firewall Some of the clients (laptops) ...
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0answers
20 views

Weird behavior with multiple pool inside shared networks on isc-dhcp-server

I have a weird behavior on my dhcp-server, I am using a load balance configuration and using multiple pool inside that shared-network, I have this configuration: shared-network "my-shared-network" { ...
2
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1answer
27 views

Determine when changed from static to dhcp?

We have a machine running Windows Server 2012 that is using DHCP for ip assignment, in an Active Directory network. It is standard protocol for us to use static ip and no one recalls changing this ...
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0answers
85 views

Using dhclient or dhcpcd to assign address for alias interface

I have a Linux machine with one Ethernet interface eth0 which already has one primary static address and one secondary static address (eth0:1) assigned. I would like to use DHCP to dynamically assign ...
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3answers
956 views

Debian 8 resolv.conf overwritten by IPv6 autoconfiguration/DHCP when DHCP disabled

I have recently installed Debian 8 on a network with IPv6 DHCP Enabled. /etc/resolv.conf is being overwritten by the IPv6 DHCP entires continually despite the fact that all IPv6 DHCP is disabled, ...
2
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1answer
66 views

Why is the DHCP lease start time greater than the end time

On our DHCP server I see this quite a bit on some of our leases and I am not sure why its being reported like this. lease <IP Address> { starts 5 2015/08/21 13:22:20; ends 5 2015/08/21 ...
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1answer
177 views

dd-wrt DHCP forwarder is not working

all. I have a network which a Windows server is running RRAS(192.168.6.1) and another Windows server is running DC,DNS,DHCP server (192.168.6.2). I added a dd-wrt flashed router. The client connects ...
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60 views

ISC DHCPv6 reservation

I've set up ISC DHCPv6 server on a CentOS 7. Here is the /etc/dhcp/dhcpd6.conf: authoritative; option dhcp6.domain-search "example.com"; default-lease-time 3600; max-lease-time 7200; log-facility ...
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0answers
29 views

DHCP based Server not updating A record

We have Citrix Servers which get IP from DHCP. After scheduled reboots, some Citrix servers are not pingable via hostname. nslookup is not able to resolve the hostname. OS: Windows 2008 R2 Citrix ...
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0answers
32 views

How to reach a private IP (DHCP enabled) from a public facing IP through NAT?

Lets say we have computers C1 and C2 C2 has two network interfaces C2.eth0(public facing) and C2.eth1 local second physical network (addr:10.10.70.101 and Nw:10.10.70.0) Now, there are multiple ...
0
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1answer
106 views

Adding 4th scope to DHCP and make a superscope in windows 2012

Hope someone can shed some light here. I have a little network drama which I'm trying to get resolve as soon as possible. To give you a little background; We have CISCO SG300 small business switches ...
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0answers
14 views

Setting up developer instance dns

We have a bunch of developers that are coding webbased solutions. They want to share the solutions on their local machines with projectmanagers and QA's etc. to let them access, test and demo the ...
2
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1answer
438 views

Multihomed windows server 2012 r2 connectivity fails

I have a Windows Server 2012 r2 with 2 NICs. 1 local(169.254.1.1/24) and 1 "public"(conected to another local network, 10.0.10.47) interfaces. I have configured DNS, DHCP ONLY on the local interface, ...
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1answer
66 views

Split and Reserve DHCP Scope with Same Subnet

For simplicity sake, let's assume I'm trying to split my DHCP scope into two halves. On one of the halves I want to use MAC address filtering. I'm essentially trying to get a certain type of device ...
2
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2answers
543 views

VMware - VM not getting DHCP address after reboot

We are having a strange behaviour in our ESX-cluster: The Infrastructure: we have 2 ESXi 5.5.0 build 2718055 in a cluster, managed by vCenter. We are using an Essentials licence, so we do not have ...
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0answers
98 views

Windows 7 can't join in Linux domain

I installed a Windows 7 in VirtualBox and a CentOS 7 x64 too. My DHCP config is : subnet 192.168.72.0 netmask 255.255.255.0 { option routers 192.168.72.1; option subnet-mask 255.255.255.0; option ...
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2answers
682 views

Do I need a managed switch for my home network? [closed]

The benefit to home routers is that all you need to do is plug them in, and they pretty much work out of the box, allowing multiple computers to use a single internet connection. Let's say I wanted ...
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1answer
219 views

Nova network DHCP not releasing ip with force_dhcp_release=True

The problem I am seeing is that when nova-network calls dhcprelease upon instance termination (due to forcedhcp_release=True) the address is not always released(syslog are not showing DHCPRELEASE ...
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1answer
214 views

How to change broadcast-flag in Windows or Linux?

As we know there are 4 types of packets involved when a client wants to get an IPv4 address from DHCP Server. These can be seen in the image bellow (from Microsoft web site). From the perspective of ...
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1answer
172 views

Configuring Sonic wall tz 500 LAN interface with a internal dns and dhcp [closed]

I trying to configuring a sonicwall tz500. I have a internal AD server with DHCP and DNS for the domain. 10.0.0.5 is the address of dhcp and DNS. question is on the LAN 0X interface, do I assign it a ...
2
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1answer
332 views

dhcp not assigning gateway

So I am running a dev server for KVM virtual machines. I have a DHCP server running locally on the host node with the following configuration: /etc/dhcp/dhcpd.conf ddns-update-style none; ...
3
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0answers
78 views

Authentication and logging of users for a Wireless ISP?

I have to upgrade a Wireless ISP's (WISP) network. Their current setup consists of a router (Mikrotik RouterBoard 1100AHx2), Ubiquiti Rockets (with sector antennas) for clients, and Ubiquiti ...
0
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1answer
111 views

Linux DHCP for multiple subnet

vlan10---->firewall----->linux dhcp server vlan20---------↑ I have two vlan(vlan10 and vlan20), and I would like to use Linux DHCP server to centralize IP address designation. In fortigate firewall ...
0
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3answers
210 views

Intel AMT and host get different IP addresses via DHCP. How to fix?

I have a server that's recently been crashing occasionally in odd ways, so I decided to configure up Intel AMT on it in the hope of being able to reset it remotely when this happens. For better or ...
1
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1answer
99 views

All DNS entries are set to static

I have a WS2008 R2 server acting as DC, DHCP and DNS server. DHCP is set to always dinamically update DNS-A and PTR records on behalf of clients, DHCP name protection is enabled and DHCP credentials ...
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1answer
51 views

Why would a DNS server issue affect only one corner of a building?

I got a complaint today from an end user whose internet was extremely slow only inside his office. Every other location in the building was fine, and the signal strength was very high even inside the ...
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1answer
38 views

Ubuntu ramdisk template

I've been working on a ramdisk template for running a complete root filesystem on the RAM of a baremetal server(over IPMI so no physical access) that boots over PXE. I used debootstrap to create an ...
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61 views

Dell PowerConnect 5324 ignoring DHCPOFFER

I've recently procured a "new" Dell PowerConnect 5324. The firmware is updated to the current version and most of it works just fine. The exception is DHCP. When I enable DHCP, it cannot seem to ...
2
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1answer
123 views

Microsoft DHCP server giving “old” lease to clients switching networks

I have 2 Windows Server 2012 R2 DHCP servers running in active/active load-balancing on one of the networks. DHCP requests from the other networks are DHCP relayed by the router to these DHCP servers. ...
0
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1answer
259 views

Ubuntu Server 15.04 as Router and DHCP Server with multiple subnets

at my company i got assigned to build a new network, where 1 ubuntu server manages DHCP for 3 subnets, allows communication of these subnets between each other and shares the connection to the public ...
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0answers
355 views

no default gateway on interface that is set up with DHCP on CentOS7

I am using CentOS7 with multiple interfaces (ens161, ens192, ens224, ens256). The box has all static IP's with the exception of one interface that is set up to DHCP (ens192). ens192 is set up as ...